One Guild Wars design decision that beats the competition is the crafting storage tab. Crafting materials stack up to 250, and one tab of your storage holds one stack of each. All storage in Guild Wars is shared, so all your (post-Searing) characters have access. You could duplicate the effect by giving players two more storage tabs, since this is effectively 36 slots, but this comes pre-organized and of course for the specific purpose of crafting. (NCSoft could also remove the cap of 250, which seems arbitrary, low for common materials and very high for rare.) Aligning with other design decisions, Guild Wars does not have tiers of crafting materials as you level up, although having a crafting tab would be even more useful there (potentially messier in the UI).
Splitting “crafting storage,” Guild Wars crafting is not exactly rigorous. The crafters are basically collector NPCs with shared materials. Storage in Guild Wars is simple, shared, and rather inadequate if you want to keep all those collector drops. The vault is expandable at $10/pane, which feels a bit pricey, although it’s tempting with all these frog and bug bits about. I need to do some muling.